Memory Jar - Start on January 1st with an empty jar. Throughout the year write the good things that happened to you on little pieces of paper. On December 31st, open the jar and read all the amazing things that happened to you that year.
I saw this idea on Facebook and just loved it. Wouldn't this be great for a kid's "Wish Upon a Star" themed birthday party?!?!?! Would be fabulous for a wedding. (I wish FB would let you pin from there!)